iframe{
    width: 100%;
    height: 100%;
    /*overflow-x:hidden;*/
    /*overflow-y:hidden;*/
}

.center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.client-container{
    width: 80%;
    margin:50px auto;
}

.client-container .border{
    margin: 20px 0;
}

.client-container img{
    width: 100%;
    height: 500px;
}

hr{
    height: 2px;
    background: rgb(30,79,90);
}

.label{
    width: 150px;
    height: 60px;
    border-left: 5px solid mediumturquoise;
    background: #f0f0f0;
    margin: 20px 0;
}

.book-list{
    display: flex;
    flex-flow: wrap;
    margin-bottom: 25px;
}

.book-list li{
    margin: 20px 10px;
    height: 450px;
    width: calc(25% - 20px);
    box-shadow:0 0 3px 2px mediumturquoise;
    border-radius: 10px;
}

.book-list li:hover{
    margin: 20px 10px;
    height: 450px;
    width: calc(25% - 20px);
    box-shadow:0 0 3px 5px mediumturquoise;
    border-radius: 10px;
    transition: 0.3s;
    cursor: pointer;
}

.book-list li .img img{
    height: 300px;
    border-radius: 10px 10px 0 0;
}

.book-list li .text{
    text-align: center;
    font-family: '楷体';
}

.book-list li .text > div{
    margin: 25px 0;
}

.book-list li .text .book-info{
    font-size: 20px;
    font-weight: bold;
}

.blank{
    height: 500px;
}